交换两个变量的值
#include "stdio.h"
int main()
{
int x = 99,y = 66;
printf("交换前:%d %d\n",x,y);
swap(&x,&y);
printf("交换后:%d %d\n",x,y);
}
void swap(int *p1,int *p2)
{
int temp;
temp = *p1;
*p1 = *p2;
*p2 = temp;
}